Window latch



Patented Jan. 22, 1929.

UNITED STATES PATENT OFFICE. I

WILLIAM S. RANK, HUBBARD WOODS, ILLINOIS, ASSIGNOR TO THE ADLAKE COMF PANY, A CORPORATION OF ILLINOIS.

' WINDOW LATCH.

Application filed April 24,

The invention relates to an improvement in that type of window latch which forms the subject of my pending application Serial No. 95,892, filed March 19, 1926, the improved latch having some features in common with the one therein disclosed.

The object of the invention is to provide a latch for use in connection with sashes hav ing narrow rails, and is especially intended for application to an upper corner of a drop sash, that is to say, a sash which is opened by being lowered into the wall.

The invention consists in a structure such as is hereinafter described and is illustrated in the accompanying drawings, in which Fig. 1 is a detail plan, partly'in section, of a window with the improved latch applied thereto;

Fig. 2 is a detail elevation of the window,

the latch casing being shown in section;

Fig. 3 is a perspective of the latch casing viewed from the inner face thereof;

Fig. 4 is a perspective of the dog-controlling lever;

Fig. 5 is a perspective of the dog; and

Fig. 6 is a sectional view of the casing on the line 6--6 of Fig. 3.

The stile of a window casing is shown at 10, and is provided with a rack bar 11, with which the dog of the latch cooperates. The top rail of a sash is shown at 12, and its side rail at 13.

The latch casing, generally represented by the numeral 14, is L-shaped and provided with suitable lugs, as 15, 16 and 17, to facilitate its attachment to the sash rails. The casing fits the corner of the sash, one of its legs, as 18, extending horizontally along the top bar or rail 12, and the other leg 19 depends along the side rail. The wall of the leg 18 which faces the window casing is apertured to accommodate the nose of the dog 20, the heel 21 of which rests against and rocks upon the inner face of the upper end of the leg 19, which is rounded to form a smooth bearing therefor.

An actuating lever 22 is L-shaped and is fulcrumed on the inner face of the end wall of the casing leg 19, which is rounded to pro- 50 vide for it a smooth hearing. The other arm of the lever extends into the leg 18 of the casing and carries a thumb-piece 23 which projects through an aperture in the upper wall thereof. The lever and dog are interlocked by means of a pair of lugs- 24:, 25,

1926. Serial Ha lo 1,285.

formed on the lever adjacent to and between which the dog loosely its anglo A spring 26, reacting between the dog and the wall of the casing,

normally holds the nose of the dog in extended or advanced position. A second spring 27 reacts the lever 22 and a wall of the casing,

mally holds the lever in retracted between and norposltion.

Downward pressure upon the thumb-piece 23 causes the lower end of the lever 22 to rock upon its bearing and to withdraw the dog by the application of pressure through the lug 24E, compressing both of the spring s. Upon the release of pressure on the thumb-piece both springs operate to restore the latch parts to normal position, advancing the retracting the thumb-piece. Shou dog and 1d either of the springs break or become displaced, the

other will function to restore the normal position. The lug 25 serves pose of retaining the latch elements in proper parts to the purrelation, should the spring 26 fail to act.

I claim as my invention- 1. A sash latch comprising an L-shaped casing, the exterior wall at the angle of the casing being internally rounded to form a pivot bearing, one leg of the casi apertured and at 1ts end belng i ng being nternally rounded to form a pivot bearing, a latching dog rocking upon the first-named bearing and having a latch projection extending through the aperture, a dog-actuating angle lever one end thereof rocking on th e secondnamed bearing and one arm thereof projecting into the other leg of the casing and pro jecting through a wall thereof, operative cong, and a nection between the lever and do spring for advancing the dog.

2. A sash latch adapted for at to an upper corner of a sash, the d tachment epending leg of the latch casing being apertured to accommodate a latching dog and the horizontal leg thereof being apertured to accommodate a thumb-piece, a dog having a rocking hearing at the angle of the casing, lever interlocking with the dog,

an angle one end one of its arms and being engagea angle w1th the dog.

ble at its too 4. In a sash latch, in combination, an L- shaped casing, a latching dog W1th1n th'ecasing; and a hell-crank shaped controlling lever, one arm thereof being pivoted Within 5 one section of the casing and the other arm thereof being housed Within the other casing section.

5. In a sash latch, in combination, a casing having a chamber adapted to extend paral- WILLIAM S. I-IAMM. 

